NCERT Solutions for Chapter: Alternating Current, Exercise 2: VSA

If a $LC$ circuit is considered analogous to a harmonically oscillating spring block system, which energy of the $LC$ circuit would be analogous to potential energy, and which one analogous to kinetic energy?
 

Draw the effective equivalent circuit of the circuit shown in Fig, at very high frequencies and find the effective impedance.

Study the circuits (a) and (b) shown in Fig and answer the following questions.

(a) Under which conditions would the rms currents in the two circuits be the same?

(b) Can the rms current in the circuit (b) be larger than that in (a)?
 

Can the instantaneous power output of an ac source ever be negative? Can the average power output be negative?

In series $LCR$ circuit, the plot of $I_{max}$ vs $\omega$ is shown in Fig 7.3. Find the bandwidth and mark in the figure.

The alternating current in a circuit is described by the graph shown in Fig 7.4 . Show rms current in this graph.

How does the sign of the phase angle $\varphi$ , by which the supply voltage leads the current in an $LCR$ series circuit, change as the supply frequency is gradually increased from very low to very high values?